From 02df1a7842da9f964d064966fe06d5dfd45a6575 Mon Sep 17 00:00:00 2001
From: Arne Dußin
Date: Wed, 28 Oct 2020 01:06:25 +0100
Subject: Add simple grid that can be scrolled

---
 src/main.rs | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index e7a11a9..faa5b7d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,42 @@
+use piston_window::grid::Grid;
+use piston_window::*;
+use sdl2_window::Sdl2Window;
+
+pub const BLACK: [f32; 4] = [0.0, 0.0, 0.0, 0.8];
+
 fn main() {
-    println!("Hello, world!");
+    let mut window: PistonWindow<Sdl2Window> = WindowSettings::new("Hello there!", [1000, 1000])
+        .build()
+        .expect("Could not initialise window");
+
+    let mut pixels_per_m = 64.;
+
+    let grid_line = Line::new(BLACK, 1.5);
+    let mut events = Events::new(EventSettings::new().lazy(true));
+    while let Some(e) = events.next(&mut window) {
+        e.mouse_scroll(|[_, y]| {
+            if y < 0. {
+                pixels_per_m *= 1.2;
+            } else if y > 0. {
+                pixels_per_m /= 1.2;
+            }
+        });
+
+        if let Some(Button::Keyboard(Key::Escape)) = e.press_args() {
+            window.set_should_close(true);
+        }
+
+        let win_size = window.draw_size();
+        let grid = Grid {
+            cols: (win_size.width / pixels_per_m) as u32 + 1,
+            rows: (win_size.height / pixels_per_m) as u32 + 1,
+            units: pixels_per_m,
+        };
+
+        window.draw_2d(&e, |c, g, _device| {
+            clear([1.0; 4], g);
+
+            grid.draw(&grid_line, &c.draw_state, c.transform, g);
+        });
+    }
 }
-- 
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